x/(x-1)+m/(x-1)=x/(x+1)
(x+m)/(x-1)=x/(x+1)
x(x-1)=(x+m)(x+1)
x²-x=x²+(m+1)x+m
-(m+2)x=m
x=-m/(m+2)
因?yàn)闊o(wú)解
即根是增根
x=-1時(shí)
m/(m+2)=1
m=m+2
不存在
x=1時(shí)
m/(m+2)=-1
m=-m-2
2m=-2
m=-1